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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3a3b623f78464ef343b00b28cd0a06baa12dd8f424f8483c8d73cd0492fb83f' 
  AND token = 'ikhpvaavwj4YOjKRUVUR07oRj+kJ6EKqPsF0O4HvOjo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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