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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c631b5b9b680d84ed7e979c539b45c007b45873e069808006d9153f924cf96fb' 
  AND token = 'q2A6bqqsk5lDEYehapJDrkue6MJP38yeM1Yy//UynQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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