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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91640ae6a982eaaaea9c8c165ed35d5cb02c6c937c831ed6ba73ab86b5d6b2ab' 
  AND token = '30SUqmbTbf8e3NTZMgErsMipGY/T/ugv1vaUZv7hC2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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