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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7a0874c266095dc99079ec525962e0da2f8b98cf087578243dc70690ffcb34a' 
  AND token = '0O9u2kksf63qHgpGmXxESSV/WwFZkS5AjZ6vFlPb1Y0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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