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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fac46039c624a4e41d67b8c1172caa71949943e4e536c261612cd3444a1b343' 
  AND token = 'YH+Q36HwyNNjen+HDWQgtSr1ylzxFL4//5ts0CTZYn8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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