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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9099f356f6236a2530546d5ee6af8ca64bdb08f8cc4e5131af3aea77da13c8f9' 
  AND token = 'rvUsKHv4t4Hnrwbzykhq4IOp3hoGLF3ClTkOdSKh8WQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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