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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89eceda7510eba079fa2923434b70b0f09a65cce1a60ae288c2ca24d7c383989' 
  AND token = 'KfQfH6Ji1yPq/H5yNNLzn11Gf+5XuQzGzt3mQGrFON8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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