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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '167cb130c5036f480ae6f229936b3ec9c0877b8900ea0c51d560a002be1b9ae0' 
  AND token = '90iGqd096d8LRBvy/oULt4VFmqzC+19raM1z9oxy1qo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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