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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4774b0b66f4e08141404d66f82a54640128b147b5f2d7e7eb5b778553aac8252' 
  AND token = 'f5LWPK7v5wmDvsHPra0IhbjcuoXKdGYq1h5MOe9T//M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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