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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f0a8c07e96c27be11a23700e9fbd9f055199306a5f57cb2a5fe45d5fa9b0ce9' 
  AND token = 'lc1QkxYnIQivI0bXZ1AXCDgfmCzuhQsrcTg8/Pv2WI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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