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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bed3b9a8e3a63034f3b492216936f3897b8bc0bcb56e201c5debdf4182bbe9dd' 
  AND token = 'Wy5p+VUQyMO4s0mqygFTEZ9t7riHsakwEwYnwi1RQeQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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