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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a7ed94ab0f79e3b4806161229b9fcb53b9b6e937c8310bc8d8243c6d185f21b' 
  AND token = 'm/COZ5VPD6fp394Hm0WBAF3DzDrS6XzG0DuktQCj/Eg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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