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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74f3d73611c6164cae53b60feaf1d4000ab8457ab98b90c1ed49846d7c1c4a0c' 
  AND token = 'xrQlsADqwTbJEQUB/buBZYQ9lg7AGMhnQw4J1lIFqkk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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