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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b042cdd813a8f6d7f43c53cfdb26e7a96c4ed87ecc2ab24c66a75f0cb9363583' 
  AND token = 'UKbZwmzsWzVkIXbzKW761lZi3t80Hgpk0fwu23flzbg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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