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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a862e05deb36db8dfcc49759d3e6920e14e2630612ce9b83b15a3b7b7373a0de' 
  AND token = 'qqkfJbBmB0+Do2gj3hMx4M202761KnxM0mJ6WpUXwPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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