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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75c8500d252d686f7082f71afccba717a8c2f4d3bb057b11cdcf36c67036f47c' 
  AND token = 'x8OYULrGKLNz03eUQH6M3oJimF3k/Wcp9+GURUY+S4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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