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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a363fa6a79a2e16792213b7ac6c4fd2af39cbef253130cc7304bc15d426112c3' 
  AND token = 'GS+0V6arL2Sbzet0lbNa14899vmoihhkspKI0Ka2nIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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