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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fceefcbc7082a8c996c21c360d3f15d21410c5be38dfe6c1938f7a912b27719d' 
  AND token = 'I7ecW2d9v/jyBxpqF1MwSxwwaIbLyCPzSdoCgooc0FQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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