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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f0a127864145c1c11d19894eb6ea0e9c00197f2a793964cb1aca7beaa5a5435' 
  AND token = 'DIfDi0r0IfbQYv/kbz1Y5ZZVc8qDCZkx7bwLWsUuY+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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