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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8418df250c50bdce95a3ed0fa4b44fc3fa7c2ce6429904e286fc00e60c55acad' 
  AND token = 'ghB+yJi9wNrPzF52+uVY9mHfrszJLvelAs7fNZUqE68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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