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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03ea5d359aecf6be792808127bd27f0d2730a862f584f1a6e183e90cd46c2c28' 
  AND token = '1MLpLfG8xcMG8+5uHM7Zqizl55B+NgG8/JbcbXIksoY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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