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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b9a39a97b93b1c0caa40a5327e6c34115c94e2958d624342d26db08afbfe18d' 
  AND token = 't8Z1IkljGXvM/dRgw9f4gWvKKCMA3Fi96t9NQ/zffs4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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