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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f6369298f4b45149c9eb897daa1cb464a53a707af14a619544cb3320e463846' 
  AND token = 'd57xaGhOGXgUcEwoxjGLSTep7iY2h8Jy7sC6PCSxLWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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