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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e5187dbc46afafd0203a4a0c12b75767d71a9bd46d94c1fe84c27757d6ca59a' 
  AND token = 'zOI4taO2oiDzx7twa9BnzncG5Bala4xF+nR1SxsVwXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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