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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47f304ce7427dc53c25bbe636e26629213c038b11bfb6806e9f08a794420accd' 
  AND token = 'Juoxc8fgKnl65Z+Gqd1C8deMCVn1c7T1a/xxC+lKjOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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