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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fd7f2af263e45d106a909c246823fce307c4f8dfd22c8d7a67bebdb375f699d' 
  AND token = 'ysEuTl5j4lhhwctZo905FKkA1Th2qw6sXHj7ujYirlE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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