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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a03403a5d8413c1df82424c02ce3928d4b65acd9dc7fdb28a72ea3b1b79893f' 
  AND token = 'uX91Ozt0cswxtzwVjQIkM6aPLarWguo8TYWsXWI3ZIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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