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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3b075972b7186a8d08ea9a18f44eb0dcae48b0731c1f18ab994e38fcfbd609f' 
  AND token = 'mNW/kVmOfbhLgOQ2Nyp0c1GsvvdI99cjMIp0CtbVbMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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