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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e296ec13d34bf19344b9b33b7c2c4da25d9b27b2e4559c1b27d4cccac2bc1eb' 
  AND token = 'Cai3gCoGWlU+m89/TtLwhOVfK/1YKX9WFpM6aPnmrr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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