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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f4970d8ea35257269246b89e70ae8fa0c28b83ad7d5c7f3d33cadd14becd232' 
  AND token = 'BlbaCXQKOAQ+vVC9RVaYjr9duQQi45ssDeAG0yPnY78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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