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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea357680da7d8b99baa9dde4fa4c43fd96bfb9dc432b105d030c861943c08e0b' 
  AND token = 'nMlBVRlWbamee6Jnn1khC0QnRTtOCKauc0npjDp8FNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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