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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbf9792b94880a05ee8ac5f7f0bd5d1e79ca1d02abfd9a77985384ca41bc4723' 
  AND token = 'xhDHyFAyR8WyFN6n7n78VJ03lsptRdx8GMWBzjdUQw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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