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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2aad17c1f29730ec1147c6edc02701c79b7dc1b9ae5b5e3c70bf7678910d975d' 
  AND token = 'la5Fw92paW1hLUMwkqpB0dWWqRR//ZhgXX3aDq9YTjc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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