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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efbbebf2a8d3ee048b3e9c622415af48659bcd2ce9403ed8655c50c4b8c8591e' 
  AND token = 'IUm8vxPO3YgWr/wJtW+FTO/NeesXLDahq30xOQNrZkE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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