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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7f93f4f823a87d16123d3eaa7cc68c359937677a77304ef4bb1b3ac80f8a581' 
  AND token = '7T2icUM2E2UL0yx527uADzu3EsU9YGBg98mKVcRep/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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