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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b77fddf208472bdd7b48dc1924af829281a8c871eb3d9673f9881bb9cf5635b4' 
  AND token = 'eN+03ivbE32yU9i5dighJA+TZIOD9B1/YaSTz1Y/Edg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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