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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4d2f37020d431092a45b4eac1f3127f1d59ebf0799d057e9d4555fa2fb767b7' 
  AND token = 'G0PH8cF2mCaJRgjgTr67fGqQTeX217vm44U3Wnjehcw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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