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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f671ed7c05cdf660e2cae594500c6b250cd1d6b9919dd50b1a6e5897c753080' 
  AND token = '9UTXcTqvDUUR5i9oBNDoaaDLRI1UFHhaBxgWV2TQHvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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