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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6406b90b11f39d3977b42980e9822e370e759ad7cd97b74d5ba4a65d975594c4' 
  AND token = 'A7VXa5/eA9jB2pvPD4TRfEUUkQghQfz2v3zA39Re7ZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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