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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9847831e621f97637a76a0c3bb8bd598af14e3c6fcc2275a0b9b3941e7507d3' 
  AND token = 'B8hkCRh/eAly2lZd13nw0AAJ7SmkhE4kNGskVs9wc8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}