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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd2c30b6ce9e5d74b5e72e2b4e9fecb51e5f251ebbc8f21a74479aca894e4fef' 
  AND token = 'lZw6QBi7t+zb7wRib9WTwcb79Nn6lH6a9SuFT/sTTSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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