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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17f6b189f037865e46371222030bd0ed6a4d397292f68d419e6d3aa76e20ede0' 
  AND token = 'wmdZT8thw+NgsIDvkjBwGy+rf5G1gXthCdtiEnIi2SU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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