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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e6a5669078b9607815f8ee0abcf4a7f0d68a2f966f788c7103a4b03cd12afa0' 
  AND token = 'pC37bvkDAeMQBnebCXN5VowkN10v0BQUfQ80pxf4Jbo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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