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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd78c8c6f958b34ad5cfe9933130ce7e059bc6eb5d3df29fb672d35c1ff1cf47' 
  AND token = 't/lCNmG6pyYMGbKDNmXxMDZ86jGe7fIbFAsyI+eZgC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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