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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfe2252a219406c48d3b822e5668a852d09ee39287191dd2ccd1570822dcbb03' 
  AND token = 'glJiFFl2ffUCBF47Rl9DZMYrlT9oqSMo6++lpsLDijo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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