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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '341e73d56d222767d76325488c6237d5c368885a4ae1fb2d4855fdd58e40aea9' 
  AND token = 'k7yvExXSa7MbOQJRQG0Dgf+jl8fZxVyH+mm8euT5vZ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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