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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef5823d9d9a3b9833512819a06d29403a1079a9ab29651e8a168c0d755a7d055' 
  AND token = 'poFwRBa/Jexf+byxuDNqu3f5kJkzoAy/PZzAI78L91U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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