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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e55a309e7c1aaa6b58fd362fe82fcf04a3cda9927db2c94e01ef9c6ce993aeae' 
  AND token = 'F+D6f4ztC82Ulj4PoAo38cItdO78R6RR7OcGvH1uvWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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