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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e7bad296fc683e52d95cf31923e69b970bc22ed74df6c522dec95aea0a1ead0' 
  AND token = 'NpVlrm7METlrg1S4qM2BdbVL06VYTzNEulxX4dtG3o8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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