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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74aef1afe697e69bc9d63033d857062184a192b2198f0a3fa825247487b1028f' 
  AND token = '6dEs71FaJjP7C1Nyr7O9z1YxTbr5uxwUEMPyDS8R1sc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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